News

Identifying the origin of nitrous oxide dissolved in deep ocean by concentration and isotopocule analyses

Abstract.

"Nitrous oxide (N2O) contributes to global warming and stratospheric ozone depletion. Although its major sources are regarded as bacterial or archaeal nitrification and denitrification in soil and water, the origins of ubiquitous marine N2O maximum at depths of 100–800 m and N2O dissolved in deeper seawater have not been identified. [...]"

Source: Scientific Reports 
Authors: Sakae Toyoda et al.
DOI: 10.1038/s41598-019-44224-0

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The Equatorial Undercurrent and the Oxygen Minimum Zone in the Pacific

Abstract.

"Warming‐driven expansion of the oxygen minimum zone (OMZ) in the equatorial Pacific would bring very low oxygen waters closer to the ocean surface, and possibly impact global carbon/nutrient cycles and local ecosystems. Global coarse Earth System Models (ESMs) show, however, disparate trends that poorly constrain these future changes in the upper OMZ. [...]"

Source: Geophysical Research Letters
Authors: Julius J.M. Busecke, Laure Resplandy and John P. Dunne
DOI: 10.1029/2019GL082692

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Diversity and relative abundance of ammonia- and nitrite-oxidizing microorganisms in the offshore Namibian hypoxic zone

Abstract.

"Nitrification, the microbial oxidation of ammonia (NH3) to nitrite (NO2) and NO2 to nitrate (NO3), plays a vital role in ocean nitrogen cycling. Characterizing the distribution of nitrifying organisms over environmental gradients can help predict how nitrogen availability may change with shifting ocean conditions, for example, due to loss of dissolved oxygen (O2). [...]"

Source: PLoS ONE
Authors: Evan Lau et al.
DOI: 10.1371/journal.pone.0217136

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Ammonium availability in the Late Archaean nitrogen cycle

Abstract.

"The bioavailability of essential nutrients such as nitrogen and phosphorus has fluctuated with the chemical evolution of Earth surface environments over geological timescales. However, significant uncertainty remains over the evolution of Earth’s early nitrogen cycle, particularly how and when it responded to the evolution of oxygenic photosynthesis. [...]"

Source: Nature Geoscience
Authors: J. Yang et al.
DOI: 10.1038/s41561-019-0371-1

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Diapycnal dissolved organic matter supply into the upper Peruvian oxycline

Abstract.

"The eastern tropical South Pacific (ETSP) hosts the Peruvian upwelling system, which represents one of the most productive areas in the world ocean. High primary production followed by rapid heterotrophic utilization of organic matter supports the formation of one of the most intense oxygen minimum zones (OMZs) in the world ocean, where dissolved oxygen (O2) concentrations reach less than 1 µmol kg−1. [...]"

Source: Biogeosciences
Authors: Alexandra N. Loginova et al.
DOI: 10.5194/bg-16-2033-2019

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Flooding Makes Big 'Dead Zone' Off Louisiana Coast Likely

"The year's widespread flooding has made it likely that a big, oxygen-starved "dead zone" off Louisiana's coast will form this summer, the head of the National Centers for Coastal Ocean Science said Thursday. Preliminary computer model runs "indicate a large to very large year," for the area where there's too little oxygen to support marine life, Steven Thur told the Mississippi River/Gulf of Mexico Hypoxia Task Force during a meeting livestreamed from Baton Rouge. [...]"

Source: The New York Times

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Variations in ocean deoxygenation across Earth System Models: Isolating the role of parametrized lateral mixing

Abstract.

"Modern Earth System Models (ESMs) disagree on the impacts of anthropogenic global warming on the distribution of oxygen and associated low‐oxygen waters. A sensitivity study using the GFDL CM2Mc model points to the representation of lateral mesoscale eddy transport as a potentially important factor in such disagreement. Because mesoscale eddies are smaller than the spatial scale of ESM ocean grids, their impact must be parameterized using a lateral mixing coefficient AREDI. [...]"

Source: Global Biogeochemical Cycles
Authors: A. Bahl, A. Gnanadesikan and M.‐A. Pradal
DOI: 10.1029/2018GB006121

Read the full article here.


AGU Fall Meeting 2019

As AGU marks its Centennial in 2019, we return to San Francisco, the home of the Fall Meeting for more than 40 years. Join our diverse community at the newly renovated Moscone Center as we collaborate across borders and boundaries to explore and develop our research. Don’t miss this once-in-a-lifetime opportunity to participate in Centennial presentations and special events that will bring to life the past, present and the future of our science.

Today we experience "Science at the Speed of Life." Fall Meeting will prepare you for what’s ahead: rapid developments in our science, new approaches to observing our Earth and beyond, the introduction of new data streams, growing demand for accessible science, the expansion of convergent science, and more. There is no better place than Fall Meeting to look into the future and develop your skills and your understanding of other disciplines at the same time.

At Fall Meeting, we will draw inspiration from each other and will show how earth and space science enables a more resilient and sustainable future for all.

Read more about the conference on the official website.


../common/calendar Start Date: 12/8/19

World Congress  on Climate Change

2nd World Congress  on Climate Change will be held during September 26-28, 2019 at Berlin, Germany.Climate Change-2019 is an excellent platform for professionals and who are working in the field.

The annual conference creates a platform for experts interaction, simultaneously with networking opportunities and also provides an opportunity to explore the innovative ideas of the other communities, companies and associations.Climate Change -2019 conference includes Plenary lectures, Keynote lectures and short courses by eminent personalities from around the world in addition to contributed papers both oral and poster presentations.

It aims to discover advances, practical experiences and innovative ideas on issues related to Climate Change as well as a breadth of other topics. Don t miss this opportunity to connect with your peers at this scientific event. Your participation in the conference will enhance your knowledge and professional skills.

This International Conference on Climate Change is a gathering of experts, professionals, academicians and researchers from all over the world. Meet experts, strengthen and update your ideas at Climate change-2019.

Read more about the conference on the official website.

 


../common/calendar Start Date: 9/25/19

International Conference on Paleoceanography

The conference will be hosted at the University of New South Wales (UNSW). UNSW is located close to one of the most iconic beaches in Australia and a short bus ride away from Sydney's central business district.

Following the traditional ICP format, the conference will be organised around invited plenary oral presentations as well as large and vibrant poster sessions. Networking will be at the centre of the ICP, with numerous social events including the Paleomusicology concert and conference dinner.

The lively city of Sydney has a rich cultural heritage and offers adventure and entertainment for all ages and tastes. Breathtaking coastal national parks, the Blue Mountains and the Hunter Valley, known for Australia’s finest wines, are only a daytrip away.

A range of existing pre- and post- Conference field trips will be organised in New South Wales, New Zealand and potentially the Great Barrier Reef. For those with time for exploring, Sydney is the gateway to iconic travel locations including the Great Barrier Reef, Uluru, and Kakadu National Park.

Read more about the conference on the official website.

 


../common/calendar Start Date: 9/1/19
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